Trigonometry

A trapezium is a quadrilateral (has four sides).

Two sides are parellel, but the other two are not.

To find the area of it, the formula is: 1/2 h(a+b)

Positive x negative = negative

(Negative x positive = negative)

Positive x positive = positive

Negative x negative = positive

So if the signs are the same the answer is positive and if they are different it is negative.

It has many purposes for exmaple building, architecture, astronomy and engineering.

Amongst the lay public of non-mathematicians and non-scientists, trigonometry is known chiefly for its application to measurement problems, yet is also often used in ways that are far more subtle, such as its place in the theory of music; still other uses are more technical, such as in number theory. The mathematical topics of Fourier series and Fourier transforms rely heavily on knowledge of trigonometric functions and find application in a number of areas, including statistics.

An elipse is like a circle that is a bit flattened.
an ellipse is an oval.

Two types of trigonometry are recognized: planar and spherical. Planar is 2-dimensional, while spherical is 3-dimensional. Though these are different fields, spherical trigonometry is really just an application of planar trigonometry in several planes.

It is said that Rene Descartes was lying, ill in bed, when he noticed an insect on the ceiling. He realised that he could identify the exact location of the insect by specifying only two numbers: the distance of the insect from a given corner of the room in two different directions.

That sounds like a triangular prism.

A number that makes an equation true is its solution.

Reciprocal of Cosine is Secant

The amplitude of a sine (or cosine) curve is the difference between the maximum and minimum values of the curve, measured over a whole cycle.

According to the stories surrounding its development, yes.

Some trigonometry mathematicians also worked on other aspects of mathematics. Hope that answers your question.

The word trigonometry comes from two Greek words, trigonon, meaning triangle, and metria, meaning measurement. This is the branch of mathematics that deals with the ratios between the sides of right triangles with reference to either of its acute angles and enables you to use this information to find unknown sides or angles of any triangle. Trigonometry is not just an intellectual exercise, but has uses in the fields of engineering, surveying, navigation, archicecture, and even rocket science.

Excuse me for asking, but are you attending the 2009 National MAO Convention that's like in 4 days? Reply:

LOL, wow, I thought the same thing!! The kids at my school are already done with their chalk talks! :)

they us it in computer graphics

an equilateral triangle has 3 congruent sides and angle measures.

It is a shape that is not regular.

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Artem Analyticam

Log (x^3) = 3 log(x)

Log of x to the third power is three times log of x.

Sine = Opposite divided by Hypotenuse Opposite is the side of the triangle opposite the angle (in this case the 90o angle). Hypotenuse is the side opposite the right angle in a right angle triangle. Therefore, Sine 90 = 1 because the opposite side and the hypotenuse are the same side, they are both opposite the right angle.

That is the definition. If you take your unit circle (a circle with radius 1 centered at the origin (0,0). you start at (1,0) and go counterclockwise around the circle 90° you end up at (0,1) that 0 is the cosine of the angle 90°

In fact, you don't even need the unit circle. Take a circle of any radius r, and draw a ray at 90 degrees. This will intersect the y-axis. So as above, the coordinates are (0,r) (instead of (0,1)) so cos(90 degrees)=x/r=0/r=0

"Trigonometry" comes from the Greek words trigonon and metron, and roughly translates to "the measurement of angles".